Apparatus for bonding brake linings to brake shoes



1950 c. s. BATCHELOR ETAL 2,494,281

APPARATUS FOR BONDING BRAKE LININGS TQ BRAKE SHOES Filed May 13, 1948 4 Sheets-Sheet 2 Jan. 10, 1950 c. s. BATCHELOR ETAL 2,494,281

APPARATUS FOR BONDING BRAKE LININGS T0 BRAKE SHOES Filed May 13, 1948 4 Sheets-Sheet 3 frzd ezz forts- ('{l ae \5: Fa (c/zelor If Carey v I i l f HIH 1950 c. s. BATCHELOR ETAL 8 APPARATUS FOR BONDING BRAKE LININGS T0 BRAKE SHOES Filed May 13, 1948 4 Sheets-Sheet 4 In... n I Illln.

V fit/27a or-5 ({yde J. Za/ckelar 2'. Carey enact n... 10, 1950 2,494,281

APPARATUS FOR BONDING BRAKE LININGS TO BRAKE SHOES Clyde S. Batchelor, Upper Stepney, and Edward L. Carey, Bridgeport, Conn, assignois to Raybeams-Manhattan,

notation of New Jersey Application May 13, 1948, Serial No. 26,810

7 Claims.

This invention relates to improvements in bonding devices and is more particularly con- Inc., Passaic, N. J., a cor- Fig. is a detail sectional the line 5-5 of Fig. 4.

view taken along cerned with the provision of a bonding device R ferring now to the drawings for a better adapted for use in adhesively uniting brake linunderstanding of this invention, the bonding dein s t brake shoes. 5 vice is shown as comprising a front wall 6, rear The present invention contemplates the prowall 1 and side walls 8-8 which are secured tovision of a bonding device adapted for use in gether to form a relatively strong integral strucautomobile service stations, said device preferture. The lower ends of the side walls 8-8 are ably embodying eight independently operable provided with intumed flange portions 9--9 to units for applying brake linings to eight brake 10 receive and support a transversely disposed shoes, and has for an object the provision of a I-beam H, the ends of the I-beam being bolted, bonding device in which the several units may welded or otherwise secured to the supporting readily be adjusted to accommodate brake shoes flanges 9-9. The upper end of the front wall 6 of different sizes and different radii and angle of is provided with an inturned flange I2 upon curvature. which a plurality of bearing plates l3 are welded, This invention further contemplates the provibolted or otherwise secured. The upper rear sion of a bonding device in which each of the corners of the side walls 8-8 are bolted, welded several units embodies means to insure uniform or otherwise secured to the ends of a transengagement between the mating surfaces of the versely disposed T-beam l4. brake lining and brake shoes. The bonding device is shown and described as It is a further object of this invention to propreferably embodying a plurality of bonding vide a bonding device embodying infra-red lamps units which are similar in construction and operfor heating and curing the bonding material emation for applying brake lining to one or more ployed in adhesively uniting the brake lining to brake shoes. To avoid repetition, the following brake shoes. The adhesives preferably employed description of the construction and operation of in the device for bonding brake lining to brake one unit shall also apply to the other units whereshoes are of the heat-hardening type, such as in corresponding numbers have been applied to thermosetting phenolic resins or modified phecorresponding parts. nolic resins, such as resin-rubber combinations, A plurality of bearing plates l6 are welded, the adhesive being applied to the mating surfaces an bolted or otherwise secured to the upper surface of the lining and brake shoes. By mounting of the T-beam l4 to support a rear adjustment infra-red lamps in position to direct infra-red Shaft ll for rotational movement. Each bondrays against the highly heat-conductive metallic ing unit comprises a rear eccentric adjustment brake shoes, the absorption of the heat from the member l8 keyed to the shaft I! for engagerays is rapid and the bonding area containing ment against the underside of a chain l9 which the adhesive is heated quickly. is preferably of the Morse silent-chain construc- This invention further contemplates the protion. The rear end of the chain I9 is secured to vision of a bonding device which is relatively a block 2| by means of a locking plate 22 and simple and inexpensive in construction and cap screws 23, the block being welded, bolted which will not readily get out of order. h 'or otherwise secured to the upper surface of the This invention embodies other novel features, T-beam l4. details of construction and arrangement of parts A front adjustment shaft 24 is journaled for which are hereinafter set forth in the specificarotational movement in the bearing plates l3 and tion and claims, and illustrated in the accomhas an eccentric 26 keyed thereto, the eccentric panying drawings wherein: it being provided with an anti-friction sleeve bear- Fig. 1 is a top plan view illustrating a bonding 21 for engagement against the underside of ing device embodying features of the present inthe chain I 9. A spring housingv 28 is provided vention, the cover of the device being removed to at the front side of the device to engage the formore clearly illustrate the construction. ward end of the chain IS, the chain being se- Fig. 2 is a longitudinal sectional view taken cured to the housing by means of a crosspin 29 along the line 22 of Fig. 1. demountably positioned in apertures provided in Fig. 3 is a transverse sectional view taken a pair of spaced bosses 3| formed on the housing. along the line 3-3 of Fig. 2. The upper surface of the spring housing 28 is Fig. 4 is an end elevational view showing the formed with teeth 30 for meshing engagement bonding device. with the teeth formed in the chain l9. It will i. .wwi

thus be noted that the end of the chain It may 7 be adjusted relative to the housingflby merely removing the crosspin 29.

Each spring housing 28 is bored to chain-tensioning screw housing and its other end engaged against an abutment shoulder 34' formed on the screw-32.

The inner end of the tensioning screw 32 is threaded at 35 for engagement in a threaded aperture provided in the forward wall 35 of a mounting bracket 31 which is secured to the front wall 8 by means of cap screws 38. The outer end of the tensioning screw 32 projects through a bearing aperture 38 formed in the mounting bracket 31 and is formed non-circular in crosssection at 39 to receive the socket portion 40 of a wrench 4|.

A retaining plate 42 is secured to the upper flange of the I-beam II by means of bolts or cap screws 43, and is formed with retaining lugs 44 to engage against the inner surface of a brake shoe B positioned upon the chain l9. As illustrated most clearly in Fig. 2, the chain l9 has its rear end secured to the block 2| and extends inwardly and downwardly over the rear eccentric it under the brake shoe B, and thence upwardly over the front eccentric 216 for engagement with the spring housing 28.

A lever 45 is provided on the front. adjustment shaft 24 and may, if desired, be held against upward movement by means of a pin 46 mounted for'axial movement in an aperture 41 formed at the outer end of an arm 48 which is secured to the inturned flange l2 by means of cap screws 49. The locking pin 46 is normally held in its inner position, illustrated in Fig. 1, by means of a flat spring which has its one end secured to the arm 48 and its other end secured to the pin 45. An adjustment lever 52 is secured to one end of the rear adjustment shaft H to adjust the position of the rear eccentric iii. A trough-shaped metal liner 53 is provided to receive the brake shoe B, brake lining Land the intermediate portion of the chain IS. The liner 53 is preferably supported upon the I-beam i I and secured against displacement by cap screws 43.

A cover 56 is hingedly connected at 51 to the clamping plate 22, and is adapted to receive and support a plurality of infra-red lamps 58 which are disposed to direct infra-red rays downwardly against the inner surface of the metal brake shoe B to heat and cure the bonding adhesive applied to mating surfaces of the brake shoe B and lining L. The cover is provided with a suitable handle 59 to be manually engaged in swinging the cover forwardly into closed position or rearwardly into open position in engagement with stop members 5| mounted on an angle iron 82 secured to the block 2!. The infra-red lamps 58 are mounted in suitable sockets 62 which are secured to the cover 55 and connected to a source of current by means of electrical conduits (not shown).

The bonding device shown and described is particularly adapted for use in automobile repair shops for applying new sets of lining to brake shoes of automobiles. As most automobiles are provided with eight brake shoes, the bonding device is preferably constructed with eight units whereby eight brake shoes may be relined simultaneously. As illustrated in the drawings, each brake shoe and its respective lining is engaged by a flexible chain l9 to hold the friction lining in tight uniform engagement with its respective brake shoe while the bonding adhesive is being heated-andfcured by means of infra-red rays directed against the inner surface of the-brake shoes by the infra-red lamps 58. A As each chain: Band its cooperating parts are similar in constructionand operation; the description 'of'the operation of onechain and itscooperating parts cooperating parts. I V

In the operation of the bonding device. the mating surfaces of a brake shoe B and friction lining L are coated with a suitable adhesive of the also applies to the remaining chains and their heat-hardening type, such as thermosettingphenolic resins, or modified phenolic resins, such as resin-rubber combinations. The brake shoe B and its lining L are then positioned within the bonding device in the manner illustrated in Figs.

2 and 3 in the drawings. The brake shoe B and lining L are supported upon the flexible chain i9 which has its one end secured to the block 2i and its other end secured-to the spring housing 28. The eccentrics l8 and 23 are then moved to adjusted position by means of their respective operating levers 45 and 52 to dispose the chain I! at the optimum angle of contact with the iming L. The theoretical optimum position for the portions of the chain extending from the ends of the brake lining to the adjacent eccentrics would be substantially along a line tangent to the curvature of the lining. It is apparent that if the sling opening defined by the central portion of the chain I9 is too wide for the brake shoe and the lining that the point of tangency will be downwardly from the ends .of the lining and that no pressure will be exerted to hold the ends of the lining in engagement against the ends of the brake shoe. In the event the brake shoe is too large for the sling opening, it will be apparent that heavy. pressure will be exerted on the ends of the lining and that the pressure against the center of the lining will be minimized. By adjusting the positions of the eccentrics l8 and 25, it will be apparent that the sling opening defined by the chain I9 may be varied to suit a pre-determined range of sizes of brake shoes.

The chain I9 is placed under tension, to move the inner surface of the brake shoe B into abutting engagement against the stop lugs 44, by means of the chain-tensioning screw 32. Rotational movement of the screw 32 acts against the compression spring 33 to move the spring housing 23 away from the forward plate 36 of the brake 31 to draw the chain I9 into tight engagement against the outer surface of the lining L. The compression spring 33 serves to permit movement of the spring housing 28 along the screw 32 responsive to expansion or contraction of the chain i9 during the bonding operation. After a brake shoe and lining have been secured in position within the bonding device, the cover 56 is moved to its closed position and the infra-red lamps 58 are connected to a source of current. The infrared rays are directed downwardly against the inner surface of the metal brake shoe B which rapidly absorbs and transfers the heat to the mating surfaces of the brake shoe and lining to heat and cure the adhesive.

While this invention has been shown in but one form, it is obvious to those skilled in the art that it is not so limited but is susceptible of various changes and modifications without departing from the spirit and scope of the claimed invention.

We claim as our invention:

1. In a bonding device for adhesively uniting a 5 friction lining to the rim of a brake shoe, hook shaped members to engage the inner face and medial portion of a brake shoe rim to permit pivotal movement of the brake shoe, and a flexibleelement to hold a friction lining in tight engagement against the outer face of the brake shoe rim. 7

2. In a bonding device for adhesively uniting a friction lining to the rim of a brake shoe, hook shaped members to engage the inner face and medial portion of a brake shoe rim to permit pivotal movement of the brake shoe, a flexible element to hold a friction lining in tight engagement against the outer face of the brake shoe rim, and means to impart relative movement between said hook shaped members and said flexibleelement.

3. In a bonding device for adhesively uniting a friction lining to the rim of a brake shoe, hook shaped members to engage the inner face and medial portion of a brake shoe rim to permit pivotal movement of the brake shoe, 2. flexible element having its intermediate portion suspended downwardly in the form of a sling to receive and support the brake shoe and lining,

and tension applying means connected to one end of said flexible element to move the brake shoe into engagement against said hook shaped members and to press the lining into tight engagement against the outer face of the brake shoe rim.

4. In a bonding device for adhesively uniting a friction lining to the rim of a brake shoe, hook shaped members to engage the inner face and medial portion of a brake shoe rim to permit pivotal movement of the brake shoe, a flexible element tohold a friction lining in tight engagement against the outer face of the brake rim, and adjustable means to support said flex ible element to provide optimum angle of contact with said lining.

6. In a device for bonding a friction lining to the rim of a brake shoe, a casing, hook shaped members disposed within said casing to engage the inner face and medial portion of a brake 6 shoe rim, a spring housing supported for move ment relative to said casing, a flexible element to press a friction lining into tight engagement against the outer face of a brake shoe rim when the latter is engaged by said hook shaped members, one end of said flexible element being secured in fixed position on said casing and the other end of said element being secured to said spring housing, and means to move said spring housing to draw said flexible element into tight engagement against the lining of a brake shoe when the latter is engaged by said hook shaped members. f I

-7. In a device for bonding a friction lining to the rim of a brake shoe, a casing, hook shaped members disposed within said casing to engage the inner face and medial portion of a brake shoe rim, a spring housing supported for movement relative to said casing, a flexible element to press a friction lining into tight engagement against the outer face of a brake shoe rim when the latter is engaged by said hook shaped members, one end of said flexible element being secured in fixed position on said casing and the other end of said element being secured to said spring housing, means to move said spring housing to draw said flexible element into tight engagement against the lining of a brake shoe when the latter is engaged by said hook shaped members, and means adjustably positioned on opposite sides of said casing to engage and adjust the intermediate sling-like portion of said flexible element to provide optimum angle of contact with the lining of a brake shoe when the latter is engaged by said hook shaped members.

CLYDE S. BATCHELOR. EDWARD L. CAREY.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS 

